Back light assembly and liquid crystal display device having the same

ABSTRACT

Disclosed are a back light assembly for preventing discoloration and deformation caused by heat generated from a lamp, and a liquid crystal display device for displaying an enhanced image. The back light assembly includes a receiving container, a lamp, a glass substrate and a diffuser. The receiving container has a receiving space. The lamp for generating the light is disposed in the receiving space. The glass substrate is interposed between the liquid crystal display panel and the lamp. The diffuser diffuses the light generated by the lamp so as to unify a luminance distribution of the liquid crystal display panel. The liquid crystal display device includes the back light assembly.

TECHNICAL FIELD

The present invention relates to a back light assembly, and a liquidcrystal display device having the back light assembly, and moreparticularly to a back light assembly for preventing discoloration anddeformation caused by heat generated from a lamp, and a liquid crystaldisplay device displaying an enhanced image.

BACKGROUND ART

A liquid crystal display device displays an image processed by theinformation-processing device, so that a user can perceive the image.

The liquid crystal display device, one of display devices, uses a liquidcrystal, of which transmissivity is modulated according to electricfields so as to display an image.

The liquid crystal modulates the light transmissivity only. Therefore,the liquid crystal display device needs light passing through the liquidcrystal so as to display an image.

A lamp generates the light. A Cold Cathode Fluorescent Lamp (CCFL) maybe used as the lamp of the liquid crystal display device.

The cold cathode fluorescent lamp has many merits. For example, the coldcathode fluorescent lamp may be formed in a cylindrical shape having avery small diameter. The cold cathode fluorescent lamp generates whitelight that is similar to sunlight. The cold cathode fluorescent lamp hasa long life span and generates a little amount of heat in comparisonwith incandescent lamp.

The cold cathode fluorescent lamp may be arranged variously according toa size of a liquid crystal display panel.

In a small sized or a middle sized liquid crystal display device, one ortwo cold cathode fluorescent lamps are sufficient to get enoughluminance for displaying an image. In the small sized or the middlesized liquid crystal display device, a volume and a weight areimportant. The cold cathode fluorescent lamp is attached to a side of anoptical distribution-regulating device called as a light-guide plate(LGP).

This liquid crystal display device is referred to as anedge-illumination type liquid crystal display device.

Comparatively, in a large sized liquid crystal display device, one ortwo cold cathode fluorescent lamps is not enough to generate sufficientluminance, because the area of effective display region is large.

Therefore, more than three cold cathode fluorescent lamps are needed toget sufficient luminance for displaying an image. In this case, the coldcathode fluorescent lamps are arranged in parallel with each other underthe liquid crystal display panel for applying light to the liquidcrystal display panel.

This liquid crystal display device is referred to as adirect-illumination type liquid crystal display device.

The direct-illumination type liquid crystal display device may havesufficient luminance to display an image. However, the direct-typeliquid crystal display device has a variation of the luminance accordingto a region of the liquid crystal display panel.

A region of the liquid crystal display panel, disposed over the lamp,has a high luminance. A region of the liquid crystal display panel,disposed over a region between the lamps, has a low luminance.

Therefore, a diffusion plate is interposed between the liquid crystaldisplay panel and the lamp so as to reduce the variation of theluminance.

In general, the diffusion plate comprises acryl resin. The diffusionplate comprising the acryl resin is light and may be easilymanufactured.

However, when a display time becomes longer, specific characters of thediffusion plate comprising acryl resin becomes bad, so that displayquality may be deteriorated.

Firstly, the diffusion plate comprising acryl resin gets curved or sagseasily due to the heat generated by the lamp.

Secondly, the diffusion plate comprising acryl resin discolored easilydue to the heat generated by the lamp. When the diffusion plate isdiscolored, the white light generated by the cold cathode fluorescentlamp is filtered into a different color, so that display quality becomesbad.

DISCLOSURE OF THE INVENTION

The present invention provides a back light assembly preventingdiscoloration and deformation caused by heat generated from a lamp, andgenerating light having uniform luminance.

The present invention also provides a liquid crystal display devicehaving back light assembly preventing discoloration and deformationcaused by heat generated from a lamp, and displaying an enhanced image.

The back light assembly includes a receiving container, a lamp, a glasssubstrate and a diffuser. The receiving container has a receiving space.The lamp for generating the light is disposed in the receiving space.The glass substrate is interposed between the liquid crystal displaypanel and the lamp. The diffuser diffuses the light generated by thelamp so as to make the luminance distribution of the liquid crystaldisplay panel uniform.

The liquid crystal display device includes a receiving container, alamp, a glass substrate, a diffusion plate and liquid crystal displaypanel assembly. The receiving container includes a bottom face and asidewall. The bottom face and the sidewall form a receiving space. Thelamp for generating a first light is disposed on the bottom face. Theglass substrate is disposed in the receiving space. The diffusion plateincludes a diffuser for diffusing the first light. When the first lightis diffused, the first light is transformed into a second light. Theluminance of the second light is more uniform than the luminance of thefirst light. The liquid crystal display panel assembly displays an imageby using the second light.

The back light assembly and the liquid crystal display device accordingto the present invention prevent deformation and discoloration anddiffuse light effectively, so that an image quality is enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other advantages of the present invention will becomereadily apparent by reference to the following detailed description whenconsidered in conjunction with the accompanying drawings wherein:

FIG. 1 is a top view showing a back light assembly according to anexemplary first embodiment of the present invention;

FIG. 2 is a partially cut perspective view showing a back light assemblyof FIG. 1;

FIG. 3 is an enlarged view showing a portion “A” of FIG. 2;

FIG. 4 is a cross-sectional view showing a portion of a glass substrateaccording to an exemplary second embodiment of the present invention;

FIG. 5 is a cross-sectional view showing a portion of a glass substrateaccording to a modified second embodiment of the present invention;

FIG. 6 is a cross-sectional view showing a portion of a glass substrateaccording to an exemplary third embodiment of the present invention;

FIG. 7 is a cross-sectional view showing a portion of a glass substrateaccording to a modified third embodiment of the present invention;

FIG. 8 is a partially cut perspective view showing a back light assemblyaccording to an exemplary fourth embodiment of the present invention;

FIG. 9 is an enlarged view showing “C” of FIG. 8;

FIG. 10 is a cross-sectional view showing a first glass plate and asecond glass plate according to a modified fourth embodiment of thepresent invention;

FIG. 11 is a cross-sectional view showing a glass substrate according toan exemplary fifth embodiment of the present invention;

FIG. 12 is a cross-sectional view showing a glass substrate according toa modified fifth embodiment of the present invention; and

FIG. 13 is a partially cut perspective view showing a back lightassembly according to an exemplary embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1

FIG. 1 is a top view showing a back light assembly according to anexemplary first embodiment of the present invention and FIG. 2 is apartially cut perspective view showing a back light assembly of FIG. 1.

Referring to FIGS. 1 and 2, a back light assembly 100 includes areceiving container 110, a lamp 120, a glass substrate 130 and adiffusion sheet 140.

The receiving container 110 has a receiving space for receiving the lamp120, the glass substrate 130 and the diffusion sheet 140.

Referring to FIG. 2, the receiving container 110 includes a firstreceiving frame 114 and a bottom chassis 117. The first receiving frame114 and the bottom chassis 117 form the receiving space.

The first receiving frame 114 includes a first plate 111, a second plate112 and a third receiving plate 113.

The second plate 112 has a rectangular frame shape having an openinginside the rectangular frame. The glass substrate 130 and the diffusionsheet 140 are disposed on the second plate 112.

A top portion of the first plate 111 is connected with an inner portionof the second plate 112 and the first plate 111 is inclined inward. Thefirst plate 111 has a lamp fixing portion (not shown) to fix the lamp120 thereto.

A top portion of the third plate 113 is connected with an outer portionof the second plate 112. A hook 113 a is formed at a lower portion ofthe third plate 113 and is combined with a bottom chassis 117.

The bottom chassis 117 includes a bottom face 115 and a sidewall 116protruding upward from the outer portion of the bottom face 115. A hookhole 116 a corresponding to the hook 113 a is formed on the sidewall 116of the bottom chassis 117.

The lamp 120 is supported by the first plate 111 of the first receivingframe 114 and is supplied with electric power to generate first light121.

Preferably, a cold cathode fluorescent lamp may be used as the lamp 120.A plurality of the lamps 120 is arranged to be parallel with each otheron the bottom face 115 of the bottom chassis 117.

A reflecting plate 119 is interposed between the lamp 120 and the bottomface 115. The reflecting plate 119 reflects a portion of the first lightgenerated by the lamp 120 toward the glass substrate 130.

The lamps 120 generating linear light are disposed in parallel with eachother, so that a luminance distribution of the first light 121 isnon-uniform.

The luminance difference between a first region disposed over the lamp120 and a second region deviated from the lamps 120 is a maximum.

When the luminance distribution is non-uniform, brightness of imagedisplayed on a liquid crystal display panel is also non-uniform.Therefore, a display quality is lowered.

In order to prevent a deterioration of the display quality, members (notshown) for making the luminance distribution uniform are disposed overthe lamp 120. Hereinafter, the members for making the luminancedistribution of the first light 121 uniform are explained in detail.

FIG. 3 is an enlarged view showing a portion “A” of FIG. 2.

Referring to FIG. 3, the glass substrate 130 and the diffusion sheet 140are disposed on the second plate 112 of the first receiving frame 115.

The glass substrate 130 seldom gets curved or sags due to the heatgenerated by the lamp, when the lamp 120 generates the first light 112.

Further, the glass substrate 130 seldom is discolored, even though theglass substrate 130 is exposed for a long time to the first light 121generated the lamp 120.

However the glass substrate 130 is fragile. Therefore, an impact-proofglass or a tempered glass may be used as the glass substrate 130. Thetempered glass has a low thermal expansion coefficient and is imperviousto an external impact.

The thicker the glass substrate 130 is, the more impervious is theliquid crystal display device to the external impact. However, thethicker the glass substrate 130 is, the heavier is the liquid crystaldisplay device. Therefore, the thickness of the glass substrate isdetermined in consideration of the strength and the weight. Preferably,the thickness of the glass substrate 130 is about 2 mm.

Referring to FIG. 2, an impact-absorbing member 118 may be interposedbetween the second plate 112 and the glass substrate 130.

The impact-absorbing member 118 absorbs an external impact so that theexternal impact force may not be transferred to the glass substrate 130.

The glass substrate 130 includes a first face 132 and a second face 134.The first light 121 generated by the lamp 120 is incident onto the firstface 132 and exits from the second face 134.

The glass substrate 130 seldom gets curved and is discolored. However,the glass substrate 130 is transparent, so that the variation of theluminance occurs due to discretely disposed lamps 120. Therefore, thediffusion sheet 140 is disposed over the glass substrate 130 so as toreduce the variation of the luminance.

Referring to FIG. 3, the diffusion sheet 140 includes a diffusion sheetbody 142 and a light diffusion bead 144. The light diffusion beads 144are mixed with a binder 143. The binder 143 is transparent, and thebinder 143 has adhesive property. The light diffusion beads 144 mixedwith the binder 143 are disposed on both side of the diffusion sheetbody 142.

An amount of the light diffusion bead 144 is modulated, such that theHaze value is higher than about 90%.

The Haze value is a barometer indicating the transmittance and a ratioof diffusion of the first light 121 that is incident from the diffusionsheet 140. The Haze value is defined as follows.Haze value=(an amount of transmitted and diffused light/total amount oftransmitted light)×100  <Expression 1>

“The amount of transmitted and diffused light” is referred to as anamount of light that passes through the diffusion sheet 140 and isdiffused. “The total amount of light” is referred to as total amount oflight that pass through the diffusion sheet 140.

The diffusion sheet 140 is disposed on the second face 134 of the glasssubstrate 130 such that the Haze value is higher than about 90%.

Referring to FIG. 2, when the glass substrate 130 is large, the glasssubstrate 130 may sag due to the weight thereof. Therefore, asubstrate-supporting member 150 is formed on the bottom face 115 of thebottom chassis 117 so as to prevent the sag of the glass substrate 130.The substrate-supporting member 150 has a cone-shape. However, thesubstrate-supporting member 150 may have a cylindrical shape, atriangular pillar shape or a polygonal pillar shape.

The first light 121 passes through the glass substrate 130 and passesthrough the diffusion sheet 140 so that the first light is transformedinto a second light 122 that is diffused by the diffusion sheet 140.

Embodiment 2

FIG. 4 is a cross-sectional view showing a portion of a glass substrateaccording to an exemplary second embodiment of the present invention,and FIG. 5 is a cross-sectional view showing a portion of a glasssubstrate according to a modified second embodiment of the presentinvention.

Referring to FIGS. 2, 4 and 5, the glass substrate 130 is disposed onthe second plate 112 of the first receiving frame 114. The diffusionsheet 146 is disposed on the glass substrate 130. The glass substrate130 includes a first face 132 and a second face 134. Light generated bythe lamp 120 is incident onto a first face 132 of the glass substrate130. The first face 132 faces a second face 134 of the glass substrate130.

Referring to FIG. 4, a light diffusion layer 146 is formed on the firstface 132 of the glass substrate 130.

The light diffusion layer 146 includes a binder 146 a and a lightdiffusion bead 146 b. The binder 146 a is transparent and adhesive. Thelight diffusion bead 146 b has a grain-shape. The light diffusion bead146 b diffuses light.

The light binder 146 a mixed with a pre-determined amount of thediffusion bead 146 b is coated on the first face 132 of the glasssubstrate 130 by a predetermined thickness.

The light diffusion layer 146 diffuses the first light 121 generated bythe lamp 120, so that the first light 121 is transformed into a secondlight 122. The second light 122 is incident onto the first face 132 ofthe glass substrate 130, and the second light 122 exits from the secondface 134 of the glass substrate 130.

In FIG. 5, the light diffusion layer 146 is formed on the second face134 of the glass substrate 130.

The light diffusion layer 146 formed on the second face 134 of the glasssubstrate 130 includes a binder 146 a and a light diffusion bead 146 b.The binder 146 a is transparent and adhesive. The light diffusion bead146 b has a grain-shape. The light diffusion bead 146 b diffuses light.

The binder 146 a is mixed with a predetermined amount of the diffusionbead 146 b and coated on the second face 134 of the glass substrate 130by predetermined thickness.

The light diffusion layer 146 diffuses the first light 121 generated bythe lamp 120, so that the first light 121 is transformed into the secondlight 122.

Preferably, the light diffusion layer 146 formed on the first face 132or on the second face 134 has the Haze value that is higher than about90%.

Embodiment 3

FIG. 6 is a cross-sectional view showing a portion of a glass substrateaccording to an exemplary third embodiment of the present invention, andFIG. 7 is a cross-sectional view showing a portion of a glass substrateaccording to a modified third embodiment of the present invention.

A light diffusion portion 135 is formed on a glass substrate 130. Forexample, an impact-proof glass or a tempered glass may be used as theglass substrate 130. The tempered glass has a low thermal expansioncoefficient. The tempered glass is impervious to external impact.

A first light 121 generated by the lamp 120 is incident onto a firstface 132 of the glass substrate 130. The first face 132 faces a secondface 134.

Referring to FIGS. 6 and 7, the light diffusion portion 135 is formed onthe first face 132 or on the second face 134.

The light diffusion portion 135 may be formed via various manufacturingmethods. For example, the light diffusion portion 135 may be formed viathe sand blaster process on the first face 132 or on the second face 134of the glass substrate 130 having plate-shape, or a roller may roll onthe face of the glass substrate 130 to make an embossing pattern on theface of the glass substrate 130, when the glass substrate is notcompletely hardened.

The light diffusion portion 135 diffuses the first light 121 generatedby the lamp 120 so as to make a luminance of light uniform.

Preferably, the light diffusion portion 135 formed on the first face 132or on the second face 134 has the Haze value that is higher than about90%.

Embodiment 4

FIG. 8 is a partially cut perspective view showing a back light assemblyaccording to an exemplary fourth embodiment of the present invention andFIG. 9 is an enlarged view showing “C” of FIG. 8.

In FIG. 8, the same reference numerals denote the same elements in FIG.2, and thus the detailed descriptions of the same elements will beomitted

Referring to FIG. 8, a glass substrate includes a first glass plate 137and a second glass plate 138. A structure of the glass substrate havingthe two plates seldom is deformed or sags. The first glass plate 137 andthe second glass plate 138 are disposed on the second plate 112 of thefirst receiving frame 114. A diffusion sheet 145 is interposed betweenthe first glass plate 137 and the second glass plate 138.

Referring to FIG. 9, a diffusion sheet 145 includes a diffusion sheetbody 145 a and a light diffusion bead 145 b. The light diffusion bead145 b is mixed with binder 145 c and coated on the diffusion sheet body145 a.

An amount of the light diffusion bead 145 b is modulated, such that theHaze value is higher than about 90%.

For example, a thickness of the glass substrate including the firstglass plate 137, the diffusion sheet 145 and the second glass plate 138is about 2 mm. Therefore, the thickness and the weight of the liquidcrystal display device are reduced.

FIG. 10 is a cross-sectional view showing a first glass plate and asecond glass plate according to a modified fourth embodiment of thepresent invention.

Referring to FIG. 10, a glass substrate includes a first glass plate 137and a second glass plate 138. This structure of the glass substratehaving the two plates seldom is deformed or sags. A light diffusionlayer 146 is interposed between the first glass plate 137 and the secondglass plate 138. The light diffusion layer 146 transforms a first light121 generated by the lamp 120 into a second light 122.

The light diffusion layer 146 includes a light diffusion bead 146 b anda binder 146 a. The binder 146 a mixed with the light diffusion bead 146b is coated on the first glass plate 137 or on the second glass plate138.

FIG. 11 is a cross-sectional view showing a glass substrate according toan exemplary fifth embodiment of the present invention, and FIG. 12 is across-sectional view showing a glass substrate according to a modifiedfifth embodiment of the present invention.

Referring to FIG. 11, a glass substrate includes a first glass plate 137a and a second glass plate 138. A lower face of the first glass plate137 a has an embossing pattern. The lower face of the first glass plate137 a faces the second plate 138.

Referring to FIG. 12, a glass substrate includes a first glass plate 137and a second glass plate 138 a. An upper face of the second glass plate138 a has an embossing pattern. The upper face of the second glass plate138 a faces the first plate 137.

Both of a face of the first plate and a face of the second plate mayhave the embossing pattern.

Hereinafter, a liquid crystal display device having the back lightassembly described above is disclosed in detail.

FIG. 13 is a partially cut perspective view showing a back lightassembly according to an exemplary embodiment of the present invention.

A liquid crystal display device 600 includes a first receiving frame110, a back light assembly 100, a liquid crystal display panel assembly200, a second receiving frame 300, a top chassis 400 and a back cover500. The back light assembly 100 includes a lamp 120 for generatingfirst light 121, a glass substrate 130 and a diffusion plate. Thediffusion plate includes a diffusion sheet 140 for transforming thefirst light 121 into a second light 122, a light diffusion layer or alight diffusion portion.

The back light assembly 100 may be one of the embodiments disclosedabove.

The second receiving frame 300 is in contact with an edge portion of theglass substrate 130 disposed on a second plate 112 of the firstreceiving frame 110 so as to fix the glass substrate 130.

The second receiving frame 300 has a rectangular shape. A liquid crystaldisplay panel guide 310 is formed on the second receiving frame 300 soas to guide the liquid crystal display panel assembly 200.

An impact-absorbing member 118 may be interposed between the secondreceiving frame 300 and the glass substrate 130 so as to absorb anexternal impact transferred to the glass substrate 130, and so as tosupport the glass substrate 130.

The liquid crystal display panel assembly 200 is disposed on the secondreceiving frame 300. The second receiving frame 300 supports the liquidcrystal display panel assembly 200. A liquid crystal display panel guide310 fixes the liquid crystal display panel assembly 200.

The liquid crystal display panel assembly 200 includes a liquid crystaldisplay panel 210, a tape carrier package (not shown) and a printedcircuit board 220.

The liquid crystal display panel 210 includes a thin film transistorsubstrate 216, a liquid crystal 214 and a color filter substrate 212.

A first end of the tape carrier package is connected to the thin filmtransistor substrate 216 and a second end of the tape carrier package isconnected to the printed circuit board 220.

The printed circuit board 220 is bent in accordance with a bottomchassis 117 of the back light assembly 100 to be disposed under thebottom face 115 of the bottom chassis 117. A back cover 500 fixes theprinted circuit board 220 disposed under the bottom face 115.

The top chassis 400 presses an edge portion of the liquid crystaldisplay panel 210 to fix the liquid crystal display panel 210 andprotects the liquid crystal display panel 210 and the glass substrate130.

Hereinafter, a process of displaying an image is explained.

The lamp 120 generates the first light 121. The first light 121 isincident onto the glass substrate 130 and passes through the glasssubstrate 130. Then the first light 121 is incident onto the lightdiffusion sheet, the light diffusion layer or the light diffusionportion described above. The light diffusion sheet, the light diffusionlayer or the light diffusion portion diffuses the first light 121, sothat the first light 121 is transformed into the second light 122 havinguniform luminance.

In order to transform the first light 121 into the second light 122, thediffusion sheet having the light diffusion bead may be disposed on theglass substrate.

In order to transform the first light 121 into the second light 122, thelight diffusion layer may be formed on the glass substrate 130.

In order to transform the first light 121 into the second light 122, theglass substrate may have the light diffusion portion which is anembossing pattern formed on a face of the glass substrate 130.

The first light 121 passes through the diffusion sheet, the lightdiffusion layer or the light diffusion portion to be transformed intothe second light 122. The second light 122 may be diffused additionally.The second light 122 is applied to the liquid crystal display panel 210.

The liquid crystal display panel 210 transforms the second light 122into an image light 123 having image information. When the image light123 arrives at eyes of user, the user perceives an image of the imageinformation.

INDUSTRIAL APPLICABILITY

The back light assembly according to embodiments of the presentinvention reduces the variation of the luminance distribution andprevents concentration of light. The back light assembly also preventsdiscoloration. Therefore, the back light assembly enhances the displayquality.

Although the exemplary embodiments of the present invention have beendescribed, it is understood that the present invention should not belimited to these exemplary embodiments but various changes andmodifications can be made by one ordinary skilled in the art within thespirit and scope of the present invention as hereinafter claimed.

1. A back light assembly for applying light to a liquid crystal displaypanel, comprising: a receiving container having a receiving space; alamp disposed in the receiving space, for generating the light; a glasssubstrate interposed between the liquid crystal display panel and thelamp; a diffuser for diffusing the light generated by the lamp so as tomake uniform a luminance distribution of the liquid crystal displaypanel.
 2. The back light assembly of claim 1, wherein the diffuser is afirst diffusion sheet disposed on a first face of the glass substrate,the first face facing the liquid crystal display panel.
 3. The backlight assembly of claim 2, wherein the first diffusion sheet comprises afirst diffusion sheet body having an upper face and a lower face, and alight diffusion bead disposed on the upper face and the lower face. 4.The back light assembly of claim 1, wherein a bottom face of thereceiving container includes a substrate-supporting member forsupporting the glass substrate.
 5. The back light assembly of claim 1,wherein the glass substrate comprises a first glass plate, a secondglass plate and a second diffusion sheet interposed between the firstglass plate and the second glass plate.
 6. The back light assembly ofclaim 5, wherein the second diffusion sheet comprises a second diffusionbody and a light diffusion bead disposed on both faces of the seconddiffusion body.
 7. The back light assembly of claim 1, wherein thediffuser comprises a binder and a light diffusion bead mixed with thebinder, the binder being disposed on a first face of the glasssubstrate, the first face facing the lamp.
 8. The back light assembly ofclaim 1, wherein the diffuser comprises a binder and a light diffusionbead mixed with the binder, the binder being disposed on a second faceof the glass substrate, the second face facing the liquid crystaldisplay panel.
 9. The back light assembly of claim 1, wherein thediffuser is an embossing pattern formed on a first face of the glasssubstrate, the first face facing the lamp.
 10. The back light assemblyof claim 1, wherein the diffuser is an embossing pattern formed on asecond face of the glass substrate, the second face facing the liquidcrystal display panel.
 11. The back light assembly of claim 1, whereinthe diffuser has a Haze value higher than about 90%.
 12. The back lightassembly of claim 1, wherein the glass substrate comprises two glassplates, and the diffuser is an embossing pattern formed on at least oneface of the two glass plates, the face being disposed between the twoglass plates.
 13. The back light assembly of claim 1, wherein the glasssubstrate comprises a first glass plate, a second glass plate, a beadand a binder; the bead being mixed with the binder and interposedbetween the first glass plate and the second glass plate.
 14. A liquidcrystal display device comprising: a receiving container including abottom face and a sidewall, the bottom face and the sidewall forming areceiving space; a lamp disposed on the bottom face, for generating afirst light; a glass substrate disposed in the receiving space, thefirst light advancing toward the glass substrate; a diffusion plateincluding a diffuser for diffusing the first light to transform a secondlight having a more uniform luminance than the first light; and a liquidcrystal display panel assembly for displaying an image by using thesecond light.
 15. The liquid crystal display device of claim 14, whereinthe diffuser is an embossing pattern formed on a first face of the glasssubstrate, the first face facing the lamp.
 16. The liquid crystaldisplay device of claim 14, wherein the diffuser is an embossing patternformed on a second face of the glass substrate, the second face facingthe liquid crystal display panel.
 17. The liquid crystal display deviceof claim 14, wherein the diffuser is a diffusion sheet disposed on asecond face of the glass substrate, the second face facing the liquidcrystal display panel.
 18. The liquid crystal display device of claim17, wherein the diffusion sheet comprises a diffusion sheet body and alight diffusion bead for diffusing the first light, the light diffusionbead being mixed with a binder and disposed on both face of thediffusion sheet body.
 19. The liquid crystal display device of claim 14,wherein the glass substrate comprises a first glass plate, a secondglass plate, a bead and a binder; the bead being mixed with the binderand interposed between the first glass plate and the second glass plate.20. The liquid crystal display device of claim 14, wherein the glasssubstrate comprises two glass plates, and the diffuser is an embossingpattern formed on at least one face of the two glass plates, the facebeing disposed between the two glass plates.